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Organization, Basis of Presentation, and Summary of Significant Accounting Policies Concentration of Credit and Business Risk (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2017 USD ($) dealer | Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Jun. 28, 2017 USD ($) | Apr. 02, 2015 USD ($)
Concentration Risk [Line Items] |  |  |  |  |
Capitalized offering costs |  |  | $ (1,498) |  |
Total debt | $ 53,403 | $ 71,086 |  |  |
Concentration risk, credit risk, line of credit period | 14 days |  |  |  |
Number of independent dealers | dealer | 205 |  |  |  |
Customer Concentration Risk [Member] |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk percentage | 6.80% | 5.30% | 4.70% |  |
Unit Volume [Member] |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk percentage | 40.60% | 31.90% | 33.70% |  |
Secured Debt [Member] |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Total debt |  |  |  | $ 160,000 | $ 80,000
Additional Paid-in Capital [Member] |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Capitalized offering costs |  |  | $ (1,498) |  |

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